<template>
    <div>
     <!-- 面包屑导航 -->
     <el-breadcrumb separator="/">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>商品列表</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图区域 -->
     <el-card>
         <!-- 搜索框区域 -->
         <el-row :gutter="20">
             <el-col :span="8">
                 <el-input placeholder="请输入内容" v-model="queryInfo.query" clearable @clear="clearQuery">
                    <el-button slot="append" icon="el-icon-search" @click="selectQuery"></el-button>
                 </el-input>
             </el-col>
             <el-col :span="4">
                 <el-button type="primary" @click="goAddpage">添加商品</el-button>
             </el-col>
         </el-row>

         <!-- table表格区域 -->
         <el-table :data="goodslist" border stripe>
             <el-table-column type="index"></el-table-column>
             <el-table-column label="商品名称" prop="goods_name"></el-table-column>
             <el-table-column label="价格(元)" prop="goods_price" width="95px"></el-table-column>
             <el-table-column label="商品重量"  width="70px" prop="goods_weight">
             </el-table-column>
             <el-table-column label="创建时间" width="140px">
                 <template slot-scope="scope">
                     {{scope.row.add_time | dateFormat}}
                 </template>
             </el-table-column>
             <el-table-column label="操作" width="130px">
                 <template slot-scope="scope">
                     <el-button type="primary" icon="el-icon-edit" size="mini"></el-button>
                     <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeById(scope.row.goods_id)"></el-button>
                 </template>
             </el-table-column>
         </el-table>

         <!-- 分页区域 -->
         <el-pagination
           @size-change="handleSizeChange"
           @current-change="handleCurrentChange"
           :current-page="queryInfo.pagenum"
           :page-sizes="[3, 5, 7, 10]"
           :page-size="queryInfo.pagesize"
           layout="total, sizes, prev, pager, next, jumper"
           :total="total" background>
         </el-pagination>
     </el-card>
    </div>
</template>
<script>
export default {
  data () {
    return {
      // 查询参数对象
      queryInfo: {
        query: '',
        pagenum: 1,
        pagesize: 10
      },
      // 商品列表
      goodslist: [],
      // 总数据条数，用于分页
      total: 0
    }
  },
  created () {
    this.getGoodsList()
  },
  methods: {
    async getGoodsList () {
      const { data: res } = await this.$http.get('goods', { params: this.queryInfo })
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品列表数据失败！')
      } else {
        this.$message.success('获取商品列表数据成功！')
        this.goodslist = res.data.goods
        this.total = res.data.total
        // console.log(this.goodslist)
      }
    },
    // 切换每页展示条数
    handleSizeChange (newSize) {
      // console.log('handleSizeChange打印：' + newSize)
      // 打印了page-sizes的选中项
      this.queryInfo.pagesize = newSize
      this.getGoodsList()
    },
    // 切换当前页
    handleCurrentChange (newPage) {
      // console.log('handleCurrentChange打印：' + newPage)
      this.queryInfo.pagenum = newPage
      this.getGoodsList()
    },
    // 查询功能
    selectQuery () {
      // v-model双向绑定queryInfo.query 然后直接调getGoodsList()
      this.getGoodsList()
    },
    // 当搜索框清空时
    clearQuery () {
      // 还是直接调getGoodsList()
      this.getGoodsList()
    },
    // 删除商品功能
    async removeById (id) {
      const confirmResult = await this.$confirm('此操作将永久删除该商品, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除操作')
      } else {
        const { data: res } = await this.$http.delete(`goods/${id}`)
        if (res.meta.status !== 200) {
          return this.$message.error('删除失败')
        } else {
          this.$message.success('删除成功')
          this.getGoodsList()
        }
      }
    },
    // 添加商品（代码跳转路由）
    goAddpage () {
      this.$router.push('/goods/add')
    }
  }
}
</script>
<style lang="less" scoped>
</style>
